Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Normal Mode
- Normal mode is used for routine testing of vehicle. To read diagnostic trouble codes, ensure battery voltage is at least 11 volts, throttle valve is fully closed, transaxle/transmission is in Neutral and all accessories are off.
- All models are equipped with 2 Data Link Connectors (DLCs). Data Link Connector No. 1 (DLC1) is located in engine compartment. Data Link Connector No. 2 (DLC2) is located under left side of instrument panel. See Fig 1. Codes can be retrieved by using DLC1 or DLC2.
- To retrieve codes, turn ignition on. DO NOT start engine. Using a jumper wire, connect terminals E1 and TE1 together either on DLC1 or DLC2. See Fig 2. Count number of flashes from Malfunction Indicator Light (MIL).
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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